Color Science & Image Fidelity Flashcards

What is the viewing angle standard for critical display evaluation recommended by SMPTE and ISF?

Answer: Zero degrees (direct axis)

Critical display evaluation requires measuring and viewing on-axis (0°) to avoid the color shift and luminance falloff that occur at off-axis angles.

Which term describes the ratio of the brightest white to the darkest black a display can simultaneously reproduce?

Answer: Contrast ratio

Contrast ratio is the measurement of maximum white luminance divided by minimum black luminance measured under identical display conditions.

In the context of display calibration, what does 'grayscale tracking' assess?

Answer: Whether all gray values maintain the correct white point across the tonal range

Grayscale tracking verifies that the display's white point (color temperature balance) remains consistent from near-black through peak white, with no color cast at any luminance level.

What is the function of the Electro-Optical Transfer Function (EOTF) in a display system?

Answer: Converts the electrical video signal into the corresponding light output

The EOTF defines how a display converts its incoming digital signal values into emitted light luminance levels, determining the display's tone reproduction.

Which color space encompasses the largest gamut and is used as a reference for cinema production and HDR mastering?

Answer: Rec. 2020

Rec. 2020 (BT.2020) defines the widest standardized color gamut, covering approximately 75.8% of the CIE 1931 color space, used as the target for UHD and HDR content.

When a display exhibits 'color decoding errors,' which control is used to correct the color saturation level in ISF calibration?

Answer: Color (Chroma/Saturation)

The Color or Saturation control adjusts the amplitude of the chroma signal, correcting errors where colors appear either washed out or oversaturated.

What is the recommended minimum ambient light level for a critical viewing environment per ISF standards?

Answer: Less than 4 lux at the screen surface

ISF recommends maintaining ambient light below 4 lux at the screen surface in a dedicated viewing room to prevent veiling glare from compromising perceived contrast.